Pump



Jan. 13,1925. "1,523,342 G. HART PUMP Filed Nov. 22, 1923 2 Sheets-Sheet 1 G. HART PUMP Filed Nov. 22, 1923 2 Shee ts-Sheet 2 Patented an. 13, 1925.

- UNITED STATES PATENT OFFICE GEORGE HART, OF LONG BEACH, CALIFORNIA, ASSIGNOR OF ONE-HALF TO GEORGE E. FULLER, OF LONG BEACH, CALIFORNIA.

PUMP.

Application filed November 22, 1923. Serial No. 676,320.

To all whom'z't may concern:

Be it known that I, GEORGEHART, a citizen of the United States, residing at Long Beach, in the county of Los Angeles and State of California, have invented new and useful Improvements in Pumps, of which the following is a specificatioin I This invention relates to pumps and more particularly to multistage pumps.

It has been proposed to use reciprocating pumps in combination to increase a line pressure of discharge from the combined pumps, but anobjection to an ordinary combination where each pump has a separate suction from any sourceis that the pumps discharge their contents in oppositlon to each other to the common discharge line. In other words, two pumps eachhaving separate suctions operate against each other when discharging the substance into a common line.

An object of the present invention is to provide a reciprocating pump combination in which the suction side of one pump is con- 26 nected to the discharge' side of another pump so as to receive a discharged substance from the attached pump at the full discharge pressure and to increase the pressure in the line by the operation of the 'pumpreceiving 30 the substance from the initial stage pump.

- Other objects will be made manifest in the following specification of an embodi-' ment of the invention illustrated in the accompanying drawings in which,

Fig. 1. is an elevational view' showing a combination of pumps acting in multiple stakge leading to a discharge line.

ig. 2 is an elevation showing a hook-u of pumps to enable either pump to be utilizes as the initial. stage and either pump tobe utilized as the second stage. I

Pumps ofconventional reciprocating type are indicated at A and B, each having suction connections 2. The suction connections be extended to any source of supply an these connections are adapted to be closed or opened at'will as by a respective valve 3. To provide for multistage operation of the pumps, the valve'3, for instance, of the pum B will be closed and the suction 2 of t e ump B isdesigned to receive the disc ar e from the pump A through suitable ii ttings including a connecting pipe 5 in which ma bearrauged a valve 6 connected to the ischarge outlet 4'? of the pump A. The discharge outlet 4 of the pump B isconnected by a pipe 7 attachedto a valve 8 on one side of a common discharge line L. On the other side of the line is provided a valve 8 connected by a pipe 7 to the outlet 4* of the pump A. In the operation of this form of hookup, the valves 3 and 8 being closed and the valves 6 and'8 being open, the primary stage pump A discharges through the outlet 4 into the pipe 5 at its full working pressure which is taken up by the pump B on its suctionstroke and increased on its discharge stroke by discharge of the material through the pipe 7 past the valve 8 and thence into the line L. It will be seen that the secondary pump B receives the material operated upon rom the pump A at full pressure from the latter and the energy of t e pump B is expended" in boosting up the pressure to a oint' which; has been found in practice to be about double the initial stage pressure from the pump A.

In case of necessit either of the pumps AB can beworke separately without a multistage action by the obvious closing of the suction valve of one pump and the opening of the other, and with the closing of the cross connection valve 6 and either valve 8 or valve 8. 0

A somewhat modified form of the hook up is shown in Fig. 2in which each pump is provided with suction valves 3- in a cross connecting line 3 which is provided with gate valves 3" on either side of the transfer pipe 5'which is double branched and provided with valves 6. The discharge of each pump A--B (Fig. 2)'is connecte to pipes '-7 respectively, leading to valves 8-8 controlling flow to the line L. In this arrangement either of the pumps AB can be used as initial or second. stage pumps by the open- .ing of their respective suction valves 3 and variations maybe resorted to within the stage pump; those valves marked by the arrows being open and the others closed. The

reverse condition of the valves would obviously reverse the direction of flow through the pumps to the discharge line.

Further embodiments, modifications and sure of material to be delivered to a line,.

said means including a pipe and valve system having an independent suction for each pump and an independent discharge for each pump, and valves arranged in said system and adapted to be set whereby either pump can-be utilized as the initial stage pump and either can be utilized as the second stage pump.

2. The combination of a set of plunger pumps and means connecting the discharge side of one pump to the .ilitalieoffthe other pump of the set, whereby" full discharge pressure is delivered to the second stage pump and the latter operates to increasethe pressure of material to be delivered to a line, said means including a pipe and valve system having an independent suction for each pump and an independent discharge for eachv pump, and valves arranged in said system and adapted to be set whereby either pump can be utilized as the initial stagepump and either can be utilized as the sec ond stage pump, and to provide for operation of either pump singly.

In testimony whereof I have signed my name to this specification.

GEORGE HART. 

